Tarnished Coast
Drakkar Lake and Jormag
Perhaps an oversight from ANET, as Drakkar was originally intended to be Jormag, but scrapped because he was not “big enough”.
That, or Jormag arose from below Drakkar.
The Making of Guild Wars 2 book calls the creature Drakkar.
Anet has made a few oversights in the dialogue – such as calling Almorra a former Tribune, dates, saying charr tech was steam powered (according to Jeff Grubb in multiple interviews, it’s clockwork not steam). The three NPCs who says Jormag rose from Drakkar Lake (1 in Hoelbrak, 2 in Frostgorge) are likely similar oversights considering how adamant Anet was about how that thing was not and could not be Jormag.
It’s also possible this was intentionally done as part of the whole storytelling of “some people/sources for information are wrong” – e.g., those three NPCs believe Jormag rose from Drakkar Lake, because that’s what norn tales (iirc, all three are norn) claim.
Stop treating GW2 as a single story. Each Season and expansion should be their own story.